Hammering tool



Jan. 22, 19 71 J- J, CARBONE AMMERI TOOL Filed Jun 30. 1924 2 Sheets-Sheet" i 9 Jad BY y MENTOR "To n N E rmss Jan. 22, 1929.

J. J. CARBONE HAMMERING' TOOL Z Sheets-Sheet 2 Filed June 30. 1924 ATTORNEY Patented Jan. 22, 1929.

UNITED STATES JOSEPH J'. CARBONE, OF BEVERLY, MASSACHUSETTS.

HAMMERING lOOL.

Application filed June 30,

My present invention has reference to improvements in automatically operated hammering tools and is especially, but not essentially, restricted for use in wood carving, countersinking, engraving, etc.-

An object is to produce a tool of this character in which a revolving element imparts a longitudinal reciprocatory movement to a hammer to bring the same forcibly into contact with the head of a tool holder, means being provided for adjusting the stroke of the tool holder and means being further provided for removably associating the shanks of different tools with the holder.

A further object is the production of a device of this character which shall be light in weight so that the same can be conveniently held by the user, and-in which a reciprocatory hammer contacts with the head of a holder for a chisel or the like, and which construction embodies desirable features of simplicity, durability and thorough efficiency in operation.

To the attainment of the foregoing and other objects which will present themselves as the nature of the invention is better understood, reference is to be had to the drawings which accompany and which form part of this application.

In the drawings Figure 1 is a side elevation of a tool in accordance with this invention.

Figure 2 is a substantially central longitudinal sectional view therethrough, upon an enlarged scale.

Figure 3 is an enlarged fragmentary sectional view through the inner portion of the handle or casing to more clearly illustrate the association of the, hammer with the rotatable means that impart a longitudinal reciprocatory movement to the hammer.

Figure 4 is a sectional view on the line 44 of Figure 3.

Figure5 is a fragmentary enlarged sectional view approximately on the line 55 of Figure 1, the chisel being removed.

Figure 6 is a sectional view on the line 66 of Fi ure 5.

Figure is a sectional view on 77 of Figure 2.

The casing 1 of my improvement also provides the handle thereof, although there may be, if desired, hand grips thereon. The casing is in the nature of a tubular member having its ends reduced. Both ends of the easing are thickened from the inner face or bore the line 1924. Serial No. 723,313.

sleeve 3. This sleeve has clamped therein by means 4 a flexible tube 5 that provides a pro- I tector for a flexible shaft 6. The shaft 6 is preferably connected to an electric motor. The shaft 6 is secured. in the outer and reduced end of a revoluble coupling 7. The coupling has its outer portion enlarged and finds a bearing on the sleeve 3 as well as in a depression in the said inner end of the casing 1. Secured in the coupling 7 there is a stem 8 that passes freely through an opening in the said inner end of the casing. The stem is formed on 'one end of a cross sectionally rounded member which I shall term a shaft 9. Arranged loosely around the shaft there are spaced shells 11 and 12 respectively, the confronting ends of the shells-being of spiral formation and providing therebetween a cam track 13. i

' Screwed in the shaft 9 there is a headless bolt member 14, and surrounding the outer and non-threaded end of the said bolt there is a roller 15. The roller is disposed in the cam grooved track 13.

The spaced shells 11 and 12 are secured by means 10 in the hollow body portion 16 of a hammer. The nose of the hammer, indicated by the numeral 17 is rounded outwardly and is thickened with respect to the body thereof. The body of the hammer is provided with a longitudinal groove, the casing being likewise provided with an aligning groove, and in these grooves there is arranged a bar 18 which provides a guide for the hammer and which prevents the turning of the hammer in the casing.

As far as the description has progressed, it will be noted that a rotary movement of the shaft 9 will, through the medium of the roller 15, traveling in the spiral grooved track 13, impart a longitudinal reciprocatory movement to the hammer.

Set in the bore of the outer and reduced end of the casing 1 there is the cross sectionally cylindrical body portion 19 of a tool holder. The end of the tool holder which enters the chamber 2 is widened and thickened to provide a head 20. The face of the head, opposite the nose 17 of the hammer is rounded. The tool holder is provided with a longitudinal groove disposed opposite a similar groove in the said reduced end of the casing,

and in these aligning grooves there is a bar or spline'21 that prevents the turning of the tool holder in the casing.

The tool holder inward of its outer end is threaded and on this threaded portion there is screwed a nut 22 that is in contact with the outer reduced end of the casing. Also screwed on the said threaded portion of the tool holder, and contacting with the nut 22 there is a jainb nut 23. By adjusting these nuts, the longitudinal movement of the tool holder may be regulated.

The tool holder has on its outer end spaced circumferential grooves 24. The inner walls of these grooves are disposed at an angle, but the outer walls thereof provide straight shoulders. Between the grooves the tool holder is provided with an aperture that communicates with the bore 26 thereof. This aperture receives therethrough a dog or detent 25 secured on one end of a flat spring 28, the second end of the said spring being fastened to the tool holder.

The spring influenced dog 25 is designed to bereceived in a notch or depression 29 in the shank 30 of a tool, such as a chisel.

Arranged to surround the outer end of the tool holder there is a collar 31 which has both of its ends flanged inwardly. Suitable means 32 is provided for limiting the sliding of the collar on the tool holder. The bore of the collar is provided with any desired number of longitudinally arranged grooves 3-3, and in each of these grooves there is received the central portions of spring members S t. From their centers each of the fiat spring members is bent at oppositeangles and extended toward the tool holder, and the ends of these angle portions are further bent to provide teeth 35 and 36 respectively, de-

gned to be received in the grooves 24, 24 and to contact with the straight outer shoulders provided by said grooves. In addition to the grooves 33 there is arranged in the bore of thecollar a longitudinally disposed groove 37 whose inner wall is beveled so that the depth of the said groove gradually decreases from the enter to the inner flange of the collar. Thus the thickened wall provided by the groove will contact with the outer end of the spring for the dog 25 and hold the dog in the notch 29 of the shank 30. When the chisel shank to be removed for replacement by the shank of a different sized chisel, the collar 31 is moved longitudinally on the tool holder, which brings the deeper portion of the groove or channel 37 opposite the spring influenced dog 25, permitting the spring 28 to draw the same out of the notch 29. When the shank of the second tool is received in the bore 26 of the tool holder, the collar is moved to initial position for locking the said shank in said bore.

The tool holder 19 is provided with a restricted passage 38 between the head 20 and the bore 26 thereof, the said passage aligning with a reduced opening 39 in the center of the nose 17 of the hammer. By this arrangement a lubricant may be fed through the bore 26 into the hammer as well as into the chamber 2 of the casing 1 to reduce friction between the parts of the device enclosed in the chamber.

The head 20 of the tool holder is, of course, in the path of contact with the nose 17 of the hammer, and when the hammer is reciprocated in a manneras afore described, the nose 17 thereof contacting with the head 20 will impart timed blows to the tool head, causing the chisel or like tool carried thereby to be forced to its work. The depth of the cut to be made by the chisel may be regulated, as above set forth, and it is believed that the foregoing description, when taken in connection with the drawings will fully set forth the construction, operation and advantages of my improvement to those skilled in the art to which such inventions relate.

To more effectively lock the collar 31 against outward movement on the shank 30, I provide the said shank with outer threads and screw thereon a lock or stop nut 50;

Having described the invention, I claim A tool holder comprising a sleeve having an opening in one side thereof and formed with spaced peripheral grooves, a stop nut upon one end of the sleeve, a dog located within said opening, a bent flat or leaf spring secured to the dog and the sleeve and normal- 1y tending to retract the dog from the opening, a collar rotatably mounted about the sleeve and formed with a plurality of longitudinally extending grooves, a bowed leaf spring within each of said grooves but one, the bowed leaf springs having their ends engaging within said peripheral grooves in the sleeve, and said collar being rotatable whereby the dog and its spring may be received within said groove not occupied by the sec ond named springs whereby the dog will release a tool shank within the sleeve.

In testimony whereof I afiix my signature.

JOSEPH J. cannons. 

